Proton exchange membrane and truck: what they have in common

1. Step 1. Proton exchange membrane — is part of — Fuel cell. It lets protons through, but not electrons.
2. Step 2. Fuel cell — is part of — Hydrogen car. A fuel cell.
3. Step 3. Hydrogen car — is a kind of — Electric car. A hydrogen-powered electric car.
4. Step 4. Electric car — has part — Suspension. The suspension is the same as in an ordinary car.
5. Step 5. Suspension — evolved from — Leaf spring. Car suspension inherited carriage leaf springs.
6. Step 6. Leaf spring — is part of — Truck. Leaf-spring suspension.

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